Twin centrifugal pump



UNlren Param oFFicE.

HERBERT J. WOUCK AND WALTER R. W'QC, F LGLDI, CALIEDRNIA, .ASSIG-NORS T0 SUPERIOR MANFAGTURENG: GGMEANY, 0l? LDl', CALFORNLQ., A CORPORATION,

rfi/VIN GENTRFUGAL PUT-JIP.

Specification of Letters Patent.

.Patented Feb. 8, 1921.

Application filed September 11, 1919. Serial No. 323,126.

To all whom t may concern Be it known that we, Hnnsnn'r d. VOOGK and WALTER R. lNoocn, citizens or' the United States, residing at Lodi, in the county of San Joaquin and State ot Caliso arrange the runners in the casing thatthere-will virtually be no strains or end thrusts on the rotating parts, and hence the pump will be perfectly balanced.

Another object is to so arrange the parts that there will be no tendency to vacuum in the pump at the point which would cause a suction on the packing glands of the pumpshaft, and which therefore will be free from the usual tendency to suclr in air therethrough.

The above features insure that the pump may be operated with a maximum ot' eiliciency and with a minimum of power, since none of the power is wasted in overcoming end thrust, etc.

Still another object is to produce a simple and inexpensive device, and yet one which will be extremely eflicient for the purpose :for which it is designed.

These objects we accomplish by means ot such structure and relative arrangement ot parts as will fully appear by a perusal ot' the following specification and claims.

On the drawings, similar characters of reference indicate corresponding parts in the several views.

Figure l is a side elevation of our improved pump, one-half of the same being in section to show the interior of the casing.

Fig. 2 is a cross section taken on a line 2-2 of Fig. l.

lice

F ig. 3 is a similar View taken on. a line 3-3 oi Fig. l.

Referring new more particularly to the numerals ofy reference on the drawings, the numeral l denotes a suitable base, from which extend upward a pair of spaced and parallel runnereasings and 3, both these members being or" the same size. F rom the adjacent acesoif the casings flared portions a project toward each other, such flared portions narrowing down at their ends away from the main casings to form throats as at f 5, an enlarged ball-shaped inclosure 6 connecting said throats. @ne side of this chainber 6 is provided with a flanged intake ori 7. The upper edges oi the casings 2 and 3 are connected by a common pipe 8, central ot which and preferably pointed upwardly is a langed discharge orice 9. `With this Construction it will be seen that the members 2, 3, 6 and 8 form a single and continu ous chamber, which oi. course is arranged to be air and water tight except at the intake and discharge points.

lWe have described the casing members as being unit or integral parts for simplicity of' description. In practice however, the casings 2, 3 and the chamber 6 are divieed at their horizontal center line and provided with flanges 10 along their abutting edges `whereby they may be vbolted or otherwise secured. together. rlhis is both for the purpose of ease of manufacture and to enable the shaft and runners, hereinafter described, to be inserted into the casing. The lower half of the casings 2 and 3 and the lower half or" the chamber 6 are then cast in one piece, while the upper halves of these casings, together with the upper halt of the chamber 6 and the pipe 8 are also cast integral.

A driving shaft ll extends through both casings 2 and 3, and projects therebeyond, ou which shaft are secured runners 13, one oi the same being positioned in each of said casings. Each runner comprises a wall or flange lll following substantially the outer side ot theV casing and having' a hub l5 formed therewith, through which the shaft ll extends. Another wall 16, spaced from the wall 14 follows closely the curvature of the liared portion L of 'the casing, and terminates at the throat 5. Suitably curved vanes 17 connect the two walls of the runner and terminate a certain distance short of the hub l5, as shown at 18.

The shaft ll bears in and projects through stuiiing box members 1 9 formed separately from the casings and bolted onto the outer faces thereof. Arms 2() formed with the stuffing box members project outwardly from the sides thereof to bearings 2l, which support the outer ends of the shaft ll, on one end of which shaft is secured a coupling member 22 to which an electric motor or similar power plant may be connected.

It will be seen that with Vthe operation of this pump, the water drawn inY through the intake 4 will be drawn equally in between the runner-walls 14 and 16, and will thence be thrown up the pipe 8 to the common discharge 9. Any side thrust engendered by the action of one runner will be counteracted and balanced by a side thrust in the same direction of the other runner.

Also it will be noted that on account of the positioning of the hubbed wall 14; of each runner between the volume of water and the shaft bearing, there will be no tend ency to vacuum at that point in the casing, and hence the packing gland 23 in the stuifing boxes 19 will never have any tendency to leak and admit air therethrough, which would quickly destroy the efficiency and lifting power of the pump.

Thus it will be seen that we have produced such a device as substantially fulfils the objects of the invention as set forth herein.

Y While this specification sets forth Vin detail, the present and preferred embodiment of the invention, still in practice such devia- 1 tions from such detail may be resorted to as do not form a departure from the spirit of the same, as defined by the appended claims.

Having thus described our invention, what we claim as new and useful, and secure by Letters Patent is l. A centrifugal pump comprising a pair' of parallel and spaced casings, an inwardly flaring throat projecting from the adjacent faces of the casings, an enlarged chamber connecting such throats, such chamber being adapted for connection to a suction pipe, a shaft extending through the casings and chamber, stuliing boxes on the outer ends of the casings in which the shaft rotates, and runners in the casings mounted in opposed relation on the shaft, each runner comprising a wall having a hub for Vthe shaft formed thereon adjacent the stuffing box end of the casing, another -wall spaced therefrom and from the shaft following the contour of the flared throat and terminating in an opening concentric with the shaft, and vanes between the walls and terminating short of the hub.

2. A centrifugal pump comprising a pair of similar and spaced casings, each casing being provided with a flared portion narrowing down to a circular throat at the end farthest from the casing7 a spherical cham.- ber joining the throats and connected to a suction pipe, and runners mounted in the casing to turn in unison, such runners having a pair of spaced walls following the contour of the casing and throat and spaced slightly therefrom, the wall adjacent tho throat terminating at the junction thereof with the central chamber.

In testimony whereof we aflix our signatures in presence of two witnesses.

HERBERT J. lO-001. WALTER R. WOOCK,

desire to "itnesses l,

FRANK H. CARTER, BERNARD' PRIVAT. 

